Machine for non-cutting forming of metals

ABSTRACT

A machine for the non-cutting forming of metal in a hammer forging machine having a feed device for rotatingly feeding the material to the machine, in which clamping means is mounted on the machine frame and coordinated with the hammer machine, and is alternately driven by a hyraulically and mechanically acting mechanism towards the tools of the machine.

United StatestPatent 1191 1111 3,817,070 Ribhack 1451 June 1s, 1974MACHINE FOR NON-CUTTING FORMING 774.087 11/1904 Layboume et al 72/25201; METALS 1,767,810 6/1930 Place 72/252 [76] Inventor: Erich Ribback,Maximiner Acht 39.

5 Trier Germany Primary ExaminerL0well A. Larson Oct. 3 1972 141107718),Agent, 0! FirmAllison COllZll'd [2]] Appl. N0.: 294,718

' 57 ABSTRACT [30] Foreign Application Priority Data 1 Oct. 5, 197]Germany 2149577 A machine the non-cutting forming of metal in a hammerforging machine having a feed device for ro- [52] US. Cl. 72/76, 72/402tafingly feeding the material tothe machine, in which [51 Int. Cl B2113/10 clamping means is mounted on the machine fra an Fleld ofSearch...; oordinated the hammer machine and is alter- 1 1 nately drivenby a hyraulically and mechanically actl References Cited ing mechanismtowards the tools of the machine.

UNlTED STATES PATENTS 664,435 12/1900 Roberts 72/76 8 Claims, 1 DrawingFigure 5 "E 1 9 a 10 9 1 5 1]. I 2o 13 12 7 21 -1 1 I" a 2 A:

I 17 II- I A I 111 I 3 11 HI P r* l 5 1 1 11 1 v z 1 22 1.1 1 ll/ 'F l9l 1 j MACHINE FOR'NON-CUTTING FORMING or METALS In such machines, thecombined effect of the hamimpair any hammering orupsetting formingoperation.

An object of the invention is the elimination of such recoil duringhammering or upsetting metal forming as much as possible, i.e., recoilacting in opposite direction to the material feed. Accordingly, thepresent invention provides a rotatable clamping means mounted on themachine frame, and coordinated with the hammer machine, which is drivenalternately toward the tools by a hydraulically and then a mechanicallydriven feed mechanism. I

Other objects andfeatures of the present invention will become apparentfrom the following detailed description when taken in connection withthe accompanying drawing which discloses an illustrative embodiment ofthe invention. It is to be understood that the drawing is designed forthe purpose of illustration only, and is not intended as a definition ofthe limits and scope ofthe invention.

' Turning now to the drawing, there is shown a machine for thenon-cutting forming or shaping of metals which comprises a hammerforging machine 1 provided with impact tools 2. An clamping means 4 iscoordinated with the hammer machine 1, 2, on the machine frame 3 and isdriven alternately toward the tools by a hydraulically and mechanicallyoperating feed mechanism. In order to provide an upsetting formingoperation and a rotating material feed, clamping means 4, which isdriven by the hydraulically and alternately mechanically working feedmechanism, comprises a clamping device 5 which holds the material to befed, and is equipped with a motor-driven rotating device 6. Themechanically acting feed mechanism, in its interior, is designed as ahydraulically acting feedmechanism. The mechanically acting feedmechanism consists of a hollow, non-revolving, axially movable spindle 7having a threaded exterior portion which engages the internal threads arotatably driven and frontally supported adjustment collar 8. Thisadjustment collar 8, in its housing 9, is frontally supported by thrustbearing 10 and rotatably mounted thereon. The rotary drive for theadjustment collar 8 is derived from a motor-driven chain drive 11. Theplunger or piston 12 of a tubular piston rod 13 slides along thecylindrical interior wall of the hollow threaded spindle 7. The bar orrod stock is guided towards the hammer unit 1,2 by means of the Ytubular rod. At the end of its forward or feed stroke,

which is designed for rapid motion, the hydraulically acting feedmechanism 12,13 is disconnected and blocked in the cylindrical threadedspindle 7, as well as rigidly connected with the mechanically actingfeed device 7 11 which, at that moment is engaged. This causes themechanically acting mechanism 7 11 to axially displace the rotatablydriven clamping means 4 6,'over the hydraulic drive 7,12,13, against thehammering device 1,2. A switch mechanism, for the disento flow intospindle cylinder 7, thus pushing the piston gagement of thehydraulically acting feed mechanism 7,12,13 whereby a blocking effect isattained and its rigid connection to the engaged mechanically actingfeed mechanism7 1l,is depicted schematically in the drawing.

In the hollow spindle cylinder 7, at both sides of the plunger 12, thereare feed and drain ducts 14 and 15 for a hydraulic pressure agent, whichlead towards a pump 16. Pump 16 is reversible to provide alternategeneration of a high or low pressure, i.e., a superatmospheric pressureand a vacuum. In duct 15 there is a spring-loaded and, manually operatedvalve 17 which blocks the flow-back of the pressure fluid fromspindlecylinder 7 to pump 16. A branch duct 18 leads from duct 15 to ar'eversible electric switch 19 for reversible motor drive 22 for rotarydrive 8 11 of adjustment collar 8, and its housing 9 is rigidly mountedon the machine frame.

In the initial stage of a metal forming operation, a machineequippedaccording to the present invention is in the position shown inthe drawing. Mechanical drive 11,12 for adjustment collar 8is'disengaged, so

that the hollow, cylindrical threaded spindle cannot be Y shiftedaxially. Pump 16 isswitched to generate pressure. This causes the valveto open and pressure fluid or plunger forward, whereby hollow piston rod13, in rapid motion, moves or transports clamp carrier means 4 intooperational position in front of hammermachine 1,2. The air present atthe side or the piston which isnot under pressure, thus, can escapethrough I duct 14 from the spindle cylinder.

hydraulically acting feed mechanism 12,13 is disengaged and blocked inspindle cylinder 7, since a backward flow of the pressure fluid frompressure chamber 21 through the closed valve is impossible. At thispoint, the mechanically acting drive for the rotary feed of the material(bar stock) is operative with rotary drive 4,5,6

of the clamping means during non-cutting metal forming, so that recoilsfrom the clamping means are absorbed and neutralized by adjustmentcollar 8.

When the metal forming operation is completed, valve 17-is locked in itsopen position and pump 16 is reversed so as to generate low pressure(partial vac uum). The partial vacuum generated via opened duct 15 inpressure chamber 21 and branch duct 18 causes hydraulically acting feedmechanism 12,13 to return to its initial position and to reset electricswitch 19, so that mechanically acting feed mechanism 7 11 and 22 movesback to its starting position. It is expedient that, for theinterruption of the material feed during the striking power stroke ofthe tools, a conventional friction or similar clutch is provided betweenclamping device 4,5 and its rotary drive 6. This guarantees that thequality of the-metal forming during rotary material feed is notimpaired.

While only a single embodiment of the present inven- 2 tion has beenshown and described, it will be obvious to those persons skilled in theart that many changes and modifications may be made thereunto withoutdea parting from the spirit and scope .of the invention.

What is claimed is:

1. in a machine for feeding metal stock to a hammer forging device theimprovement which comprises in combination:

a clamping means for gripping said metal stock and coupled to acombination hydraulic and mechanical drive mechanism adapted to providereciprocating motion of said clamping means relative to said forgingdevice and comprising a screw spindle feeder, and

a hydraulic feeder capable of rapid motion and provided with a blockingmeans for blocking the hydraulic feeding action and rigidly connectingsaid screw spindle feeder to said clamping means at the'end of theforward stroke of said hydraulic feeder.

2. A machine according to claim 1 in which said drive mechanism isequipped with automatic means for blocking the hydraulic feeding actionand substantially simultaneously activating the screw spindle feeder.

3. A machine according to claim 1 in which movable elements of saidhydraulic feeder are located inside said screw spindle feeder.

4. A machine according to claim I in which said screw spindle feedercomprises anonrotatable, axially displaceable spindle having an externalthread engaging an internal thread of a rotatable driving and adjustingcollar mounted in a stationary housing.

5. A machine according. to claim 3in which said clamping means isconnected to a piston rod of a hydraulic piston slidable mounted withina hollow spindle of said screw spindle feeder.

6. A machine according to claim 1 in which a motor drive means isprovided for rotating said clamp means.

7. A machine according to claim 6 in which the rotary drive means isprovided with a friction clutch for interrupting rotation of said stockduring hammer strokes of said forging device.

8. A machine according to claim 2 in which said clamp means is connectedto a piston rod attached to a hydraulic piston slidably mounted inside anonrotatable hollow spindle of said screw spindle feeder and saidspindle is axially displaceable by means of an external thread thereonengaging the internal thread of a driving and adjusting collar supportedwithin a stationary housing.

1. In a machine for feeding metal stock to a hammer forging device theimprovement which comprises in combination: a clamping means forgripping said metal stock and coupled to a combination hydraulic andmechanical drive mechanism adapted to proVide reciprocating motion ofsaid clamping means relative to said forging device and comprising ascrew spindle feeder, and a hydraulic feeder capable of rapid motion andprovided with a blocking means for blocking the hydraulic feeding actionand rigidly connecting said screw spindle feeder to said clamping meansat the end of the forward stroke of said hydraulic feeder.
 2. A machineaccording to claim 1 in which said drive mechanism is equipped withautomatic means for blocking the hydraulic feeding action andsubstantially simultaneously activating the screw spindle feeder.
 3. Amachine according to claim 1 in which movable elements of said hydraulicfeeder are located inside said screw spindle feeder.
 4. A machineaccording to claim 1 in which said screw spindle feeder comprises anonrotatable, axially displaceable spindle having an external threadengaging an internal thread of a rotatable driving and adjusting collarmounted in a stationary housing.
 5. A machine according to claim 3 inwhich said clamping means is connected to a piston rod of a hydraulicpiston slidable mounted within a hollow spindle of said screw spindlefeeder.
 6. A machine according to claim 1 in which a motor drive meansis provided for rotating said clamp means.
 7. A machine according toclaim 6 in which the rotary drive means is provided with a frictionclutch for interrupting rotation of said stock during hammer strokes ofsaid forging device.
 8. A machine according to claim 2 in which saidclamp means is connected to a piston rod attached to a hydraulic pistonslidably mounted inside a nonrotatable hollow spindle of said screwspindle feeder and said spindle is axially displaceable by means of anexternal thread thereon engaging the internal thread of a driving andadjusting collar supported within a stationary housing.